Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 24: Spin Transport and Orbitronics, Spin-Hall Effects
MA 24.9: Vortrag
Mittwoch, 7. September 2022, 17:00–17:15, H37
Modeling spin transport through thin antiferromagnetic insulators — •Niklas Rohling1 and Roberto E. Troncoso2,3 — 1Department of Physics, University of Konstanz, D-78457 Konstanz — 2Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim — 3Department of Mechanical and Industrial Engineering, NTNU
Experiments have shown spin transport enhancement by a thin antiferromagnetic insulator between a metal and a ferromagnetic insulator [1]. While previous theoretical work [2] was able to reproduce some of the features of those experiments, the interface is typically described by a single parameter only. We consider a model of a thin layer NiO oriented in (111) direction, sandwiched between a metal and a ferromagnetic insulator. We take into account nearest and next-nearest neighbor exchange coupling at the interfaces as well as different magnetic order. We compute the spin current through this system using Fermi’s Golden Rule [3]. We find a sensitive dependence on the magnetic configuration as well as on the interface parameters.
[1] Wang et al., Phys. Rev. Lett. 113, 097202 (2014), Phys. Rev. B 91, 220410(R) (2015); Lin et al. Phys. Rev. Lett. 116, 186601 (2016).
[2] Khymyn et al., Phys. Rev. B 93, 224421 (2016); Rezende et al., Phys. Rev. B 93, 054412 (2016).
[3] Bender et al., Phys. Rev. Lett. 108, 246601 (2012).
Financial support by the German Research Foundation (DFG), project No. 417034116 and by the Research Council of Norway through its Centres of Excellence funding scheme, project No. 262633, "QuSpin"